I think "I will destroy you!" annoyed me the most. Especially when a female mercenary said it first, and was then soon followed by a male voice saying the SAME EXACT sentence. Hit repeat and you got yourself a tune.
The biggest kill stealer was Tali for me, Garrus kept dying, even with all the best weapons, upgrades, and armor. Tali just used carnage all the time and never let up on her shotgun. But yeah, I hope they change up the war cries and make them...better, more random, more funny? I don't know.
Oh man, I was soooo tired of hearing Garrus yell about the enemy being everywhere by the time I finished ME1, my final thought when I heard he was in ME2 was "I swear to god if he yells about the enemy I'm team killing him."
lvl:1-25 "im Garrus Vakarian- rebel and i die too much" lvl:26-35 "Garrus Vakarian- i can actually be useful in your team for more than just eye-candy." lvl:36-60 "Garrus Vakarian- Kill stealer exdrodonare."